Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1981 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE
Heat Hazard Sensor (GLC Wagon & 626)
- Turn ignition on. "Overheat Exh. System" warning light should glow. Start engine and warning light should go out. Remove passenger seat and fold back carpeting (scuff plate and floor mat on 626) to expose heat hazard sensor wiring. Disconnect sensor and use a jumper wire to jump terminals of wiring connector; warning lamp should glow.
- If warning lamp does not respond as outlined, remove and test sensor. Wrap sensor and a thermometer in aluminum foil (electrical connector must be exposed for access). Place sensor and thermometer (wrapped in aluminum foil) in container filled with oil, place a second thermometer in container of oil. See Fig 1. Connect a battery and test lamp to sensor connector as shown in Fig 1.
- Gradually heat oil. Test lamp should glow when temperature inside aluminum foil reaches 284-320°F (140-160°C). If sensor does not respond as outlined, replace heat hazard sensor.NOTE: Do not heat oil above 392°F (200°C).
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.